So imagine you have a big box with a lot of small boxes inside. Each small box has a different toy inside. You want to remember where each toy is so you can find it easily later. That's what a database does - it helps you remember where you put things.
Now let's say you have some things that don't fit in any of the small boxes. Maybe you have a big toy that won't fit, or a blanket that you just want to fold up and put on top of everything else. You can still remember where these things are, but you can't put them in the small boxes.
A non-b database is kind of like that. It's a way of remembering things that don't fit into the usual categories. Maybe you have some information that's hard to organize or doesn't fit neatly into a table or spreadsheet. A non-b database helps you keep track of all that information even if it's not organized in a really neat way. You can still find what you're looking for, even if it's not in the usual place. It's like your own special place for all the extra stuff that doesn't fit in the small boxes.